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Zygotic Nuclear F-Actin Safeguards Embryonic Development
Tomomi Okuno1, Wayne Yang Li1, Yu Hatano1
1Graduate School of Biology-Oriented Science and Technology, Kindai University, Kinokawa-shi, Wakayama 649-6493, Japan.
Cell Reports
|July 2, 2020
Summary
Filamentous actin (F-actin) assembles in mammalian zygote pronuclei, ensuring genome integrity and proper embryonic development. Its timely disassembly is crucial for developmental progression, highlighting nuclear F-actin
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Proper formation and function of pronuclei (PN) are essential for totipotent zygotes after fertilization.
- The mechanisms governing mature pronuclear formation in mammalian zygotes remain largely undefined.
Purpose of the Study:
- To investigate the role of filamentous actin (F-actin) in pronuclear formation and function in mammalian zygotes.
- To elucidate the dynamic regulation of nuclear actin and its impact on early embryonic development.
Main Methods:
- Utilized mouse zygotes for experimental observations.
- Investigated F-actin assembly within pronuclei.
- Perturbed nuclear actin dynamics to assess effects on gene regulation and development.
- Employed optogenetic control of cofilin nuclear localization to study F-actin dynamics.
Main Results:
- Filamentous actin (F-actin) assembles within the pronuclei of mouse zygotes and is critical for their full functionality.
- Disruption of nuclear actin dynamics leads to misregulation of genes involved in genome integrity and abnormal embryo development.
- Nuclear F-actin is shown to facilitate DNA damage repair, thereby preventing zygotic checkpoint activation.
- Dynamic regulation and timely disassembly of the nuclear F-actin nucleoskeleton are necessary for developmental progression.
Conclusions:
- Nuclear F-actin is a key component of totipotent zygotic pronuclei.
- Temporal regulation of the polymerized state of nuclear F-actin is essential for normal mammalian embryonic development.
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